List.find : (a -> Boolean) -> [a] -> Optional a

[rjdestigter]

Adds List.find which will return the first element in the list for which the given predicate returns true

Code review

The changes summarized below are available for you to review, using the following command:

pull-request.load https://github.com/unisonweb/base:.trunk https://github.com/rjdestigter/unisoncode:.prs._List_find

Added definitions:

 List.find                       : (a ->{𝕖} Boolean) -> [a] ->{𝕖} Optional a
 List.find.doc                   : Doc
 List.find.tests.itShortCircuits : [Result] (+1 metadata)
 List.find.tests.none            : [Result] (+1 metadata)
 List.find.tests.some            : [Result] (+1 metadata)